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x/build: setup builders simulating old processors #17478

bradfitz opened this Issue Oct 17, 2016 · 2 comments


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bradfitz commented Oct 17, 2016

We occasionally get a bug report from users that some assembly code (often in runtime or crypto or compression) causes a SIGILL.

We should run builders (perhaps in qemu?) simulating older processors so we can exercise all the assembly fallback paths and CPU detection code.

@bradfitz bradfitz added the Builders label Oct 17, 2016

@bradfitz bradfitz added this to the Unreleased milestone Oct 17, 2016

@bradfitz bradfitz self-assigned this Oct 17, 2016


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bradfitz commented Apr 24, 2017

As a starting build, @saljam made a qemu builder in the past:

Using it as a model, an x86-on-x86 builder would be interesting, masking away certain CPU features.

@bradfitz bradfitz removed their assignment Apr 24, 2017


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josharian commented Apr 24, 2017

This would also be helpful for a theoretical future RISC-V builder.

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